System of electric welding.



D H. WILSON. SYSTEM OF ELECTRiC WELDING.

APPLIChIi N HLED DEc.31,1914. RENEWED FB.24.|91e.

1 1 87,408. Patented June 13, l916.

WHTNESSES: gL; INVENTOR M w s M 4. /W\ M ATTORNEY 'rnn s ra'i rnmnnr era ron.

DAVID H. WILSON, OF PATERSON, NEW JERSEY.

SYSTEM OF ELECTRIC WELDING.

memos.

Specification of Letters Patent.

Patented June is, rare.

Application filed December 31, 1914, Serial No. 879,954. Renewed February 24., 1916. Serial No. 80,124.

To all whom it may concern:-

Be it known that 1, DAVID H. WILSON, a

citizen of the United States, and resident prevent a too great flow of current, to reduce the resistance as the arc is drawn and thereafter to vary the resistance to compensate for variations of arc resistance due to the unsteadiness of the operators hand during welding.

In the drawings, the figure shows a diagram of the circuits and apparatus of my system.

From the one pole (preferably the positive) of the generator or other source of welding current 1 a circuit is first established by way of the conductor 2, high resistance 3, conductor 4, relay .5, conductor 6 to the operators tool or terminal 7, preferably carrying the metal welding pencil 8 adapted to be brought into contact with the work 9 which may be any portion of fractured machinery or other metal adapted to be operated upon by welding. The circuit is completed by wayof conductor 10 to the other pole of the generator 1.

The contact of the terminals 8 and 9 permits enough current to pass to energize'and operate the relay 5 but not enough to permit the drawing of the are. The relay lever armature 11 when attracted causes the bridge 12 to close the circuit between the contacts 13 thereby introducing the carbon pile resistance 14 by way of the following circuit;-negative pole of the generator 1, conductor 2, conductor 15, solenoid 16, le-

solenoid, the resistance of the pile, which a is normally at its lowest point under the tension ofthe spring 19, is increased. This happens before the operator has time to start drawing his arc. As the arc is drawn and its resistance increases, the lessened current in the solenoid weakens its force, and the spring 19 reduces the resistance of the pile to compensate for the increasing length of arc. Any variation of the are due to the unsteadiness of the operators manipulation of his tool is thereafter compensated for by the solenoid and pile to render the cur-- rent substantially uniform.

What I claim is a 1. In a welding system, in combination, a source of welding current, two terminals one of which is manually operable, and between which an arc is adapted to be drawn, means exterior to-said circuit brought into said circuit when said terminals are brought into contact, to prevent a too great flow of current across said terminals, and a circuit controller adapted to automatically raise the voltage across said terminals as the are resistance rises due to the separation of said terminals, and means to automatically re- W store said system to its original condition upon the rupture of said arc.

3. In a welding system, in combination,-

a source of welding current, two terminals one of which is manually operable and between which an'arc is adapted to be drawn,

to said circuitv means normally exterior brought into said circuit when said terminals are brought into contact, to prevent a 5 too great flow of current across said terminals, and adapted to" automatically raise the voltage across said terminals as the are resistance rises through the separation of said terminals, and controlled by the current to in said arc;

Signed at New \Xork in the county of New York and State of New York.

DAVID H. WILSON. Witnesses:

MYRON Fl I G; M. HAMLIN. 

